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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2011 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.util;

import java.io.*;
import java.util.*;

import mockit.external.asm4.*;
import mockit.internal.*;

public final class SuperConstructorCollector extends ClassVisitor
{
   public static final SuperConstructorCollector INSTANCE = new SuperConstructorCollector();

   private final Map cache = new HashMap();
   @SuppressWarnings({"FieldAccessedSynchronizedAndUnsynchronized"})
   private String constructorDesc;

   private SuperConstructorCollector() {}

   public synchronized String findConstructor(String className)
   {
      constructorDesc = cache.get(className);

      if (constructorDesc != null) {
         return constructorDesc;
      }

      ClassReader cr = createClassReader(className);

      try { cr.accept(this, ClassReader.SKIP_DEBUG); } catch (VisitInterruptedException ignore) {}
      cache.put(className, constructorDesc);
      
      return constructorDesc;
   }

   private ClassReader createClassReader(String className)
   {
      try {
         return ClassFile.readClass(className);
      }
      catch (IOException e) {
         throw new RuntimeException("Failed to read class file for " + className, e);
      }
   }

   @Override
   public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
   {
      if ("".equals(name)) {
         constructorDesc = desc;
         throw VisitInterruptedException.INSTANCE;
      }

      return null;
   }

   @Override
   public FieldVisitor visitField(int access, String name, String desc, String signature, Object value)
   {
      return null;
   }
}